Air system pump filter

[Doug Allman]

In our 1991 Contessa on a Gillig chassis the air pump had a filter in the back corner by the 3116 block.  Very hard to see and change and only if you knew it was there.
Does the 2004 Marquis have a similar filter or is it using the regular air filter system for its source?
I have looked and do not see anywhere it could be on the 2004.

[Gerald Farris]

Doug,
Your engine driven air compressor uses air from the intake manifold as it's inlet source. Therefore, the engine air filter is for both the engine and compressor.

Gerald